Vitamin B Complex

What is Vitamin B Complex used for?

Vitamin B complex (e.g. Neurobion) is a combination supplement of B vitamins (B1, B6, B12) mainly used to prevent or treat B-vitamin deficiency and to support nerve and energy metabolism. Some products are marketed for peripheral neuropathy symptom relief, though clinical evidence for this is limited and it is generally used as an adjunct. In Hong Kong, such products are typically unregistered health supplements rather than regulated pharmaceuticals under the Pharmacy and Poisons Ordinance.

How to take Vitamin B Complex and adjust the dose

Typical adult dosing is 1 tablet, 1-3 times daily, or as directed on the product label or by a doctor/pharmacist. As these are non-prescription supplements, strength and dosing vary significantly between brands; no single official standard dose was found — always follow the specific product's label and avoid exceeding recommended amounts, as long-term excess B6 intake may cause nerve damage. (Confidence: moderate — no unified official dosing standard found)

Vitamin B Complex side effects

• Common: nausea, diarrhoea, stomach upset
• Rare but important: allergic reactions (rash, swelling), peripheral neuropathy from long-term B6 excess, unusual bleeding/bruising

Who should not take Vitamin B Complex?

• Contraindicated in known allergy to B vitamins or cobalt/cobalamin
• Consult a doctor before use if pregnant or breastfeeding
• Consult a pharmacist if taking other medications to avoid interactions
• Avoid long-term excessive supplementation, especially B6